Malapropisms and slips of tongue represent ways in which expression meaning can come apart from speaker meaning. Another way is when a speaker engages in some form of implicit communication, conveying a meaning other than the meaning of the words or sentences she utters. Such implicit meaning can be intended either in addition to or instead of the explicit meaning. Some regard utterance meaning as a species of speaker meaning; others regard it as a distinct level of meaning. According to the speech-act centred conception of meaning, speaker meaning has priority over expression meaning. In contrast, the expression-centred conception regards semantic properties as intrinsic to expressions. This latter view is disputed by those who (like Grice) wish to reduce expression meaning to speaker meaning or who (like Searle) regard expression meaning as depending on a Background of human practices